Messages in this thread Patch in this message | | | Date | Mon, 24 May 2010 16:04:50 -0700 | From | Mike Travis <> | Subject | [Patch 1/1] x86 efi: insert add_efi_memmap entries into both e820 maps |
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Currently, the e820_reserve_resources() function does not add entries obtained via the "add_efi_memmap" kernel cmdline option. This causes /sys/firmware/memmap/... to be incomplete (stops after 128 entries). Utilities that examine these entries then do not get the complete picture of system memory.
This patch causes the add_efi_memmap function to add the memmap entries to both the e820 map and the e820_saved map.
Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Jack Steiner <steiner@sgi.com> --- arch/x86/include/asm/e820.h | 1 + arch/x86/kernel/e820-xen.c | 5 +++++ arch/x86/kernel/e820.c | 11 ++++++++--- arch/x86/kernel/efi.c | 3 +++ 4 files changed, 17 insertions(+), 3 deletions(-)
--- linux-2.6.32.orig/arch/x86/include/asm/e820.h +++ linux-2.6.32/arch/x86/include/asm/e820.h @@ -70,6 +70,7 @@ extern unsigned long pci_mem_start; extern int e820_any_mapped(u64 start, u64 end, unsigned type); extern int e820_all_mapped(u64 start, u64 end, unsigned type); extern void e820_add_region(u64 start, u64 size, int type); +extern void e820_saved_add_region(u64 start, u64 size, int type); extern void e820_print_map(char *who); extern int sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, u32 *pnr_map); --- linux-2.6.32.orig/arch/x86/kernel/e820-xen.c +++ linux-2.6.32/arch/x86/kernel/e820-xen.c @@ -150,6 +150,11 @@ void __init e820_add_region(u64 start, u __e820_add_region(&e820, start, size, type); } +void __init e820_saved_add_region(u64 start, u64 size, int type) +{ + __e820_add_region(&e820_saved, start, size, type); +} + static void __init e820_print_type(u32 type) { switch (type) { --- linux-2.6.32.orig/arch/x86/kernel/e820.c +++ linux-2.6.32/arch/x86/kernel/e820.c @@ -33,9 +33,9 @@ * and that is also registered with modifications in the kernel resource tree * with the iomem_resource as parent. * - * The e820_saved is directly saved after the BIOS-provided memory map is - * copied. It doesn't get modified afterwards. It's registered for the - * /sys/firmware/memmap interface. + * The e820_saved is saved after the BIOS-provided memory map is copied as + * well as the optional add_efi_memmap entries are processed. It doesn't get + * modified afterwards. It's registered for the /sys/firmware/memmap interface. * * That memory map is not modified and is used as base for kexec. The kexec'd * kernel should get the same memory map as the firmware provides. Then the @@ -132,6 +132,11 @@ void __init e820_add_region(u64 start, u __e820_add_region(&e820, start, size, type); } +void __init e820_saved_add_region(u64 start, u64 size, int type) +{ + __e820_add_region(&e820_saved, start, size, type); +} + static void __init e820_print_type(u32 type) { switch (type) { --- linux-2.6.32.orig/arch/x86/kernel/efi.c +++ linux-2.6.32/arch/x86/kernel/efi.c @@ -271,8 +271,11 @@ static void __init do_add_efi_memmap(voi break; } e820_add_region(start, size, e820_type); + e820_saved_add_region(start, size, e820_type); } sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); + sanitize_e820_map(e820_saved.map, ARRAY_SIZE(e820_saved.map), + &e820_saved.nr_map); } void __init efi_reserve_early(void)
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